Originally posted by AndrewT I just listened to the first few bars of "temptation" (Athens audiophile).

I don't have the original in any format, but I can tell you that the quality coming from disco speakers (15"+compression horn) is far better than YouTube can provide.

Why do you tubers think they can demonstrate Audio Quality via that medium?

At least in that video it was something like a tribute to the dreamer audiophile. I have seen other videos though that a guy says ''here is my new speaker'' and others comment ''Good! I can say even from the video''. Just enthusiasm I guess.

great to see you latest results. It's always ensuring when practice and theory are in line.
As you write it's fun to do this exercise and it extends our understanding.

I think you can even further simplify the remote sensing, by leaving J2 and J3 in the shunt part, on the left side ground/supply. These are merely current sources, so "should not have a notion of voltage". That way you only have 2 components (ZT and Q3) as the remote sense.

Elaborating further on the idea of having dedicated shunts for each circuit stage, you can just put multiple transistors for Q1. Currents will not be matching exact, but that's not important here, since the excess current is shunted anyway. So the amount of extra components is minimal, one extra Q1 per dedicated shunt stage. Combined with remote sensing, it can still be a modular/scalable design. For example make provision for 4 shunts, what's not needed you simply don't mount on the PCB.

I don't know if this brings some sonic value though, but just for the record.

How do you test stability? Do you use a transient step response and observe the ringing?